Question

Question 5 (1 point) Hollywood stuntman, Jackie Chan, is performing a stunt for an upcoming summer movie thriller. In the stunt, he has to jump off the top of a very high apartment building and land in a crash mat below. At a point during the fall, when he is still 80.0 m above the crash mat, he is falling at a speed of 31 m/s. His mass is 84.0 kg. [CRZPBY] a. What is his gravitational potential energy at this point? b. What is his kinetic energy at this point? c. How much total energy does he have at this point? d. How high is the apartment building? e. What will his velocity be when he hits the crash mat?

Answer 1

Som 5. Given data, mass, m= 84.0kg height from the point ih=80.om speed at this point, v=31 m/s a) ennavitational potential energy at this point, PE PE= mgh 84 x 9.8 x 80 IPE = 65856 b) Kinetic eneregy at this point, KE KE = 1 m² = 1/2 2 x 84x (31² KE = 40362 ] e) Total energy at this point, TE TE = PETKE 65856 + 40362 TE I 106218 ] d) Let H be the total height of apartment and from energy conservation TE= mgH H TE

106218 H = 84 X 9.8 H = 129 m is completely converted into whent it hit the crash mat Total energy Kinetic energy TE -mv 2 2 V 2x 106218 84 50.3 onls